Grooving or necking mechanism



2 Sheets-Sheet 1 H.l1.VVELJD Sept. 5, 1950 GROOVING 0R NECKING MECHANISM Filed Jan. 2. 1947 H. H. wELD 2,521,619

GROOVING 0R NECKING MECHANISM 2 Sheets-Sheet 2 .fm/m for mrjf. y WM Sept. 5, 1950 Filed Jan. 2, 1947 Patented Sept. 17295() t uGurnoonvnve on NECKING MECHANISM Henry H. Weld, Windsor, assignor to Conel Automatic Machine Company Inc., Windsor, Vt., a corporation'of Vermont' Application January 2, 1947, Serial No. 719,807

' 1 Claim. (Cl. 77-3) A This invention relates to the cutting of grooves, particularly in internal work,y and has for an .object to provide a mechanism for cutting such grooves formed as an attachment for automatic lathes having either single or multiple spindles.

Another object is to provide such a mechanism adjustable for cutting grooves of different depths and at .diiferent ratesof feed.

l Figure 2is a sectional viewon line 2-'2 of Fig- Figures 3 and 4 are sectional viewsY on lines 3--3 and 44d, respectively, of Figure 2. t l

i Figure 5l`is a view similar ,to a uportionof Figure 4,`.but"'sh'owingvthe tool fed into the work' to the maximum' depth for which it is adjusted. f Referring to the drawings, at I is shown a support which is shaped to engageandbe secured to a cylindrical tool slide of a multiple spindle lathe such asv shown at 424 in the Miller Patent No. 2,236,440 granted March 25,- w.1941. For the purpose of securing this support to this tool slide,l it isshown as provided with one or more bolts 2, each provided with a T head 3v adapted to engage in a T slot inthe tool slide as is clearly shown in the Miller patent to which .reference has been made. 4"This tool slide is moved axially toppresent tools supported thereon into or out of operative'relation to work pieces which are carried by rotary spindles arranged with their axes parallel to the line of motion of the tool slide. One of these spindles may carry a work piece 5 shown in Figures l, 2, 4 and 5, the work piece being rotated in the direction of the arrows a shown in these figures.

The support I is provided with a bushing 6 within which is rotatable and axially slidable a hollow shaft l. This shaft is arranged parallel to the axis of the work piece in operative relation thereto, but out of coaxial relation. The end or" the shaft 'I nearest to the work pieces is provided with a head 8 across which is adjustable a tool slide 9 from which extends outwardly a lll necking or grooving tool It having a cutting edge l I in position to be presented to the work piece to accomplish the grooving or necking operation. The slide 9 may be adjusted to present the tool edge II into the proper position by means of a screw I2 in a manner well understood in the art.

The support I has slidably mounted thereon in the lengthwise direction of the shaft l, a slide I5. The slide I5 is provided with a downward extension it at its outer end within which the shaft 'I is journaled, as on the ball bearing Il, but the shaft 'l is held against relative axial motion with respect to the slide by a sleeve I8 engagingan annular shoulder It of the shaft l, a collar 20 outwardly of the slide, and a Apair of nuts 2l and 22 threaded on the rear extremity of the shaft 1. The nut 22 carries the outer raceway of a ball bearing 2li which is clamped in position by means of a ring 25 secured by screws Z5 to the nut 22. The inner raceway of this bearing 2d is secured to an internally threaded sleeve 28 threaded on a screw 29 and secured in adjustable position therealong by the tightening of a nut 3i? also threaded on the screw 29 and engaging the outer end of the sleeve 28. rfhe screw 29 is a stop screw and has threaded on its outer end portion a nut 3l which may at suitable times engage a fixed stop member 32 through which the screw 29 is slidably mounted; `Engagement of this nut 3l on the stop 32 limits the inward motion of the shaft I with its tool I0 to the desired point between the ends'of the work piece as shown in Figure 2.

The shait 'I with its tool may be retracted, however,` carrying with them the slide I5 until such time as a pair of nuts 35 threaded on a portion of the shaft l isbrought against a shoulder portion 5l of the support I, this limiting the retracted position of the tool away from the work pierce. angular position of the shaft 'l shown in Figures l, 2, 3 .and 4, the cuttingedge I I of the tool when the tool is in its inwardposition rshown is out of contact with the work, but by rocking the shaft 'I the cutting edge II may be fed into the work as shown in Figure 5 due to the eccentric relation of this shaft to the axisoi the work. This rocking of the tool into cutting relation with the work is accomplished by a further forward motion of the support I toward the work after the axial motion of the shaft l' has been stopped by impingement of the stop nut 3l, on the xed member 32. To accomplish this, the slide I5 has journaled therein adisk 4i) having a slot 4I eX- tending diametrically nearly across it, this slot serving as a in which rides a cam roller 42 vThese parts are so adjusted that in the l which is journaled on the upper end of a post 43 carried by a rack bar slide 4d (see particularly Figures 2 and 3). This slide 44 has a racl; portion 45 which meshes with pinion teeth 45 on a portion of the periphery of the shaft l, these teeth being elongated so that the rack bar meshes therewith throughout the relative axial motions of the shaft 1 and the support I. The rack bar 44 is mounted for motion in alateral way 5i] of the support I which has a pair of retaining strips 5I secured to the lower face of the support, holding the rack slide in position. The angular position of the slot 4I is adjustable in order to determine the amount of lateral motion which will be given to the rack slide 44 for any given Vrela tive sliding motion of the slide I5 and the support I, and this, as shown, may be produced by the turning of a pinion 69 journaled on a headed post GI threaded into the slide IE5, this pinion having its teeth engaging mating teeth of a gear segment portion S2 of the disk 4i'. By loosening the post 6l, the pinion Si] may be turned, as by placing over a squared portion 64 thereof a suitable wrench, and after the disk 62 has been adjusted to the desired angular position, the pinion B may be locked in the corresponding angular position by tightening the pivot post 6I in its threaded connection with the slide i5. For this purpose it is shown as provided with a polygonal socket 65 in its upper end for the reception of a correspondingly shaped wrench bar.

The slide I is normally held in its forward position with `the nuts 35 engaging the ear end of the bushing 6, as by a pair of compression springs 7) engaging over the abutment posts 'il on the support i and engaging abutment blocks 'I2 projecting from the slide i 5.

With the parts properly adjusted and with the work piece presented in tooling position, the support is brought forward, carryingthe shaft ly and the tool therewith until the tool has been brought to a predetermined position between the ends of the work piece by the impingement of the stop nut si on the member 32, the parts being shown in this position in Figures 1 and 2. The shaft l" is then in the angular position of Figures 2 and 4 with the cutting edge of the tool out of contact with the work. Further forward movement ofthe support I with the tool slide causes the support I Yto slide forwardly beneath the slide I5, causing the follower roll '112 to move within the guide slot 4I and producing a lateral travel of therack bar'M which rotates the shaft I in such a way that its eccentric relation to the work piece causes the tool edge to advance toward and into the work, cutting it to a depth determined by the angulai` position of adjustment of the disk 'wand the amount of travel of thesupport I, the tool at this time remaining in the same axial relation with the work piece.

When the work has been cut to the desired depth, a stop lug I5 projecting from the shaft 'l at the forward face of the bushing 6 and supporting an adjustable stop screw 11 brings this screw by rocking of the shaft 'I against an abutment segment 'i8 as shown in Figure 5, which is carried by a ring '19 angularly adjustable about the axis of the shaft 'I and being secured in adjusted position by bolts threaded into zthe support I and extending through slots 8| of ears 82 projecting from the ring la. This provides a positive stop which accurately limits the depth of the cut.

On retraction of the support I with the tool carrier, the springs l0 cause the slide I5 to remain in its forward position during the initial retraction, this causing the shaft I to be rocked back to its initial position, after which the support and the slide move together, retracting the shaft 'I axially and removing the ltool from between the ends of the work piece into position for a succeeding cycle of operations.

From the foregoing description of an embodiment of this invention, it should be evident to those skilled in the art that various changes and modifications might be made without departing from its spirit or scope.

I claim:

In combination, a support, a shaft journaled in said support, means for moving said support lengthwise of said shaft and of a Work piece supported for rotation on an axis parallel to that of said shaft, a tool carried by said shaft and having a cutting edge eccentric to said shaft, means for limiting the axial motion of said support in opposite directions at one of which limits said tool is positioned between the ends of said work piece, a slide on said support Within which said shaft is journaled for axial motion therewith, an actuating member carried by said support for guided motion transverse to the axis of said shaft and having a rack, said shaft having an elongated rpinion portion in engagement with said rack to cause said shaft to be turned by motion of said actuating member, a control member carried by said slide and having a Way angularly related to the axis of said shaft, said actuating member having an element engaging in said way, and spring means reacting between said slide and support tending to holdsaid slide retracted in position to retract said tool from the Work.

HENRY H. VELD.

REFERENCES `CITED The following references are of record in the file `of this patent:

UNITED STATES PATENTS Number Name Date 1,331,322 Connell Feb, 7, 1920 2,441,533 Montgomery May 11, 1948 

